MS SQL: Return all results in a single row separated by commas

This returns a 50 rows.  Instead, using MS SQL, how can I get one single row with all 50 values separated by commas?

SELECT 
  TOP 50
  NAME
  FROM [my].[dbo].[table]
    WHERE 
	PROJECTID = 699461 
	GROUP BY NAME
    ORDER BY count(NAME) DESC

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